Effects of Crowding and Availability of Food On Growth and Angling Vulnerability in the Two Sexes of Scaled and Mirror Patterned Carp (Cyprinus Carpio L.)

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In two drainable ponds stocked with two scale types of carp (scaled and mirror) the effects of differences in food availability were studied by monitoring the changes in weight, condition and body shape and the angling catchability. When the carp were starved, the fish of the two scale types lost weight to the same extent. Under these conditions male carp decreased 30% in weight, and female carp lost 10% of their initial weight. When food was available, scaled carp increased more in weight than mirror carp. The female carp showed a better growth response than the male carp. Analysis of the growth responses showed no competative interactions between scaled and mirror carp, and between males and females. Under the more favourable food conditions the carp were less catchable.